fxcalc is a platform independent scientific calculator, capable of 128-bit floating point math, and distributed under the terms of the GNU General Public License. It uses the FOX Platform Independent GUI Toolkit written by Jeroen van der Zijp, and the doubledouble floating point math library written by Keith Martin Briggs (a version of doubledouble is packaged with fxcalc; there is no need to obtain it separately).

Features

fxcalc currently provides these features (in addtion to numeric operations):

64-bit integer operations

128-bit floating point operations (using the doubledouble library)

Digit grouping

Can cut/paste data to/from the clipboard

Supports drag and drop of numbers between the calculator and other applications, and between the calculator and its statistics box

Uses tooltips in a sort of Balloon help style to show descriptions of the different functions